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Commitments and contingent liabilities (Details Textual) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
CONTINGENT LIABILITIES AND COMMITMENTS [Line Items]      
Operating Leases, Rent Expense $ 100 $ 104 $ 120
Guarantee For Performance Of Lease Agreement 26    
Operating Leases, Rent Expense, Net 46 43 $ 25
Parent [Member]      
CONTINGENT LIABILITIES AND COMMITMENTS [Line Items]      
Guarantee For Performance Of Lease Agreement 13    
NonCurrent Assets [Member]      
CONTINGENT LIABILITIES AND COMMITMENTS [Line Items]      
Guarantee For Performance Of Lease Agreement 11    
Prepaid Expenses [Member]      
CONTINGENT LIABILITIES AND COMMITMENTS [Line Items]      
Guarantee For Performance Of Lease Agreement 2    
Subsidiaries [Member]      
CONTINGENT LIABILITIES AND COMMITMENTS [Line Items]      
Operating Leases, Rent Expense $ 80 $ 36